* collectsValues} is true, called for each future when all futures complete.
   */
  abstract void collectOneValue(int index, @ParametricNullness InputT returnValue);

  abstract void handleAllCompleted();

  /** Adds the chain to the seen set, and returns whether all the chain was new to us. */
  private static boolean addCausalChain(Set<Throwable> seen, Throwable param) {

    }

    void check() {
      runTester();
      FromTo<?, ?> defaultFunction = (FromTo<?, ?>) getDefaultParameterValue(0);
      FromTo<?, ?> returnValue = (FromTo<?, ?>) defaultFunction.apply(null);
      assertEquals("", returnValue.apply(null));
    }
  }

  public void testGenericInterfaceReturnedByGenericMethod() {
    new GenericInterface2DefaultValueChecker().check();
  }

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